Modding for Fuel Economy

GENERAL General G2/G2IC Discussion
81

[QUOTE=N FUL FX;1880409]
K-series: Thanks for that link to that site. I didn’t know such a community existed. :up:[/QUOTE]

It’s a great site. I’ve gotten some really useful info from them.

Steve

82

My car with the following mods:

—Engine—

  1. Engine swap, put in a JDM B20B
  2. NGK Iridium IX spark plugs
  3. NGK Premium spark plug wires
  4. Valvoline full synthetic 5w30 oil
  5. Fram full synthetic oil filter

—Transmission—

  1. Transmission swap, put in a JDM S1
  2. GM Synchromesh Friction Modified manual transmission fluid

—Intake—

  1. AEM short ram intake
  2. K&N air filter

—Fuel—

  1. AEM adjustable fuel pressure regulator
  2. Fuel pressure gauge on fuel filter

—Exhaust—

  1. DC Sports 4-2-1 two piece ceramic header
  2. Magnaflow High-Flow catalytic converter
  3. Solo Performance Storm series muffler
  4. Tuned exhaust tip

—Suspension—

  1. KYB AGX struts
  2. Skunk2 coilovers
  3. Skunk2 front camber kit
  4. Custom rear camber kit
  5. GekiZone Performance front upper strut brace
  6. GekiZone Performance rear upper strut brace
  7. GekiZone Performance rear lower strut tie bar
  8. GekiZone Performance C-pillar brace bar

—Wheels—
SUMMER

  1. 17" Riax gunmetal with polished lip, 10 spoke
  2. Sceptor 205/40/17 summer tires
    WINTER
  3. 14" 90-92 Mazda Miata rims, painted gunmetal, 7 spoke
  4. Radial 195/60/14 winter tires

—Engine Management—

  1. JDM P08 ECU chipped to run the JDM B20B
  2. NGK O2 sensor
  3. 4 gauge main ground cables
  4. Relocated battery to the trunk

—Shift Linkage—

  1. B&M short shifter
  2. Energy Suspension shifter bushings
  3. Mugen replica shift knob

—Weight Reduction—

  1. Removed air conditioning
  2. Removed power steering
  3. Removed spare tire and jack

Gets different MPG depending on which website I use to calculate it…

http://www.eforecourt.com/calc_mpg.htm tells me I average 30.37 MPG city

http://opentoronto.com/calculators/MPG_calculator_calculate_MPG_fuel_efficiency_gas_consumption_fuel_economy.php tells me I average 25.29 MPG city

so which is it?

I usually get 430 kilometers on 40 litres of fuel. Timing is set to 18 Degrees, and currently I’m experimenting with running different octanes… so far doesn’t seem to make a difference really.

And here’s how well i take care of my car:

DUE MAINTENANCE:

oil - 317 500

PCV valve - 330 000

valve adjustment - 332 000

distributor cap and rotor - 338 000

air filter - 355 000

tranny fluid - 355 000

spark plugs - 380 000

spark plug wires - 361 000

fuel filter - 366 000

o2 sensor - 416 000

timing belt and water pump - 330 000

coolant - approximately feburary 2010 or when tested and shows badly

I have due dates for all the basic tune up stuff… Is there anything I’m missing?

And does that MPG sound about right?

83

From my calculation the 25 Miles Per Gallon is the more accurate number.

40 liters = 10.6 gal
430 km = 267.2 mi

267.2/10.6 = 25.2 mpg.

84

When I modified my car a few years back. If I remembered correctly 12 mpg. I end up lightening my car got my mpg to go from 12 to 18. I can lighten more but back then I didn’t want to take out my rear seats, lighter bucket seats, dry carbon fiber body panels(literally everything)… It was more like a waste so I just took the motor and dump the rest. Move on.

85

u think the gsr alloys are better for gas mileage then steelies?

86

I’ll be ditching my GSR’s for steelies with moon discs sometime this summer.

Steve

87

i’ve actually had the opposite experience. I cant get the same mileage as I did when I had my 14" steelies and hubcaps. there are other factors, however like psi and tire rolling resistance…but for now, it looks like steelies are better.

edit: ahh for a moment I thought you meant the GSR blades…but I havent been able to get the same mpg as my dad since i mounted some LS Mesh.
sorry I just woke up from a nap :dozing:

88

i’m not going to read through 5 pages right now. Take out all of the unnecessary shit from your car (text books, magazines, bowling shoes…) if they aren’t needed that day.

89

Read it’s good for you. Keep the brain working.

90

Obviously you were absent from school the day they taught reading. You know like read the address you’re supposed to ship people’s shit to? Oh now wait you just pocket their money and disappear.

91

:rofl: I was just waiting for someone to say it

92

Please keep this argument off this thread.

Thanks,
Steve

93

[QUOTE=ez12a;1881093]From my calculation the 25 Miles Per Gallon is the more accurate number.

40 liters = 10.6 gal
430 km = 267.2 mi

267.2/10.6 = 25.2 mpg.[/QUOTE]

If thats the case then what else should I be checking into? Hmmm this is bothering me now…

94

Here is another forum with interesting information. One example is the use of boric acid as an oil additive.

http://www.cleanmpg.com/

95

I’ve gotten up to 33 mpg…thats trying hard, 30 is easy. Just take off really slow and conserve as much speed as possible (don’t slow down for corners). But i spend 3/4 of the time on the highway. I also inflated my tires to 37 psi, and my alignment is a little off (maybe helping?)
I know that if i spent a whole tank driving on the highway i could get 600 km’s (370ish miles) no problem. That’s using about 43-45 litres (11-12-13 gallons)
My car has a cone filter and cat back exhaust and 250000 km’s on it. It’s also lowered 2 1/2 inchs with no camber kits, so maybe the hard tires combined with the large camber angle leads to less surface area of tire and better fuel economy, i know its sacrificing traction.

96

I’ve been keeping a careful log of every gasoline purchase (along with odometer readings) since I bought my Integra in June 1999. I always fill the tank right up to the top each time I gas up, and then divide miles since last fill-up by number of gallons purchased to get an average mpg over the last tank. I just put these numbers into an excel spreadsheet to extract data.

Some numbers:
Fill ups since June 1999: 262
Lowest mpg recorded: 21.74 mpg
Highest mpg recorded: 41.64 mpg
Total average mpg: 32.23 mpg
Tanks that averaged over 40 mpg: 3
Tanks that averaged over 39 mpg: 9
Tanks that averaged over 38 mpg: 19

My car is a completely stock RS with 5-speed tranny. I drive pretty conservatively. But as the miles pile up (at 232K miles now), the average mpg’s I’m seeing are slowly dropping. However, I did get 38.07 on a half-tank from Minneapolis to Fargo in May.

97

Would rasing the compression help in mpg?
How bout a catch can ?

Im willing to conclude that a port job and an exhaust polish would realy help and maybe the itr header.

98

Well I was getting 30+ today and yesterday…I visited a friend who lives an hour and a half away and one hour was highway driving. I did 60 the whole way and I got better mileage than usual. Once I got off the highway though it was back around 27 or so like usual, but the 30 and more at times is the best my DA has seen. I hate how it seems like the gauge goes down faster once you get below 1/2 tank…

99

Yeah, it’s REALLY deceiving.

Steve

100

consider pulling your power steering system in the name of fuel economy; having bypassed my power steering pump by connecting the inlet/outlet hoses (sort of a no-cost, easy way of performing the “looped rack” mod written up in the teg tips forum) and slightly overinflated the tires, i noticed a significant difference right off the bat. HOWEVER, i think there was something wrong with my pump, as i had a bad hesitation between 2500-3000 rpm that went away when i pulled the system, so i don’t know if other vehicles will experience such a noticeable difference.

also, while the concept of unsprung weight has been discussed, consider the following: steelies weigh more than alloys. racing sdiscs are almost made from steel as opposed to plastic, and therefore add a decent amount of weight (i used to run my father in law’s hubcap store); they also cost around $100/set and that $100 can probably be invested in another fuel economy mod or tune-up procedure for greater effect. i suspect the GSR alloys, which are reasonably aerodynamic in their own right, are actually more efficient in terms of fuel efficiency, trading a slightly increased drag coefficient for a lighter weight. a good example of this concept are the wheels that went on the Honda Insight; if steelies/hubcaps were more efficient, they would have used them.

PS - gas gauges are really imprecise, and basically only good for pointing out when you need gas and when you don’t!